I am only just beginning to test out the
Mavic 3 so I'm not the best one to answer this. I'm sure many others with far more experience can address this well.
This video may help answer the question:
In this video,
the narrator says you should stick to using just the 1x and 7x settings, that the zoom image quality is not good. However, that video was made a year ago and there have been some improvements since then....
In this video you can see the quality of different zoom settings.
On the standard lens, 1x is great, and 2x looks decent, 4x looks bad.
On the telephoto lens, 7x looks great, 14x is grainy but passable, 28x looks bad.
However, interestingly, he shows you that 28x on the telephoto lens is actually better quality than the 4x on the standard lens.
The 7x of the fixed telephoto is much, much better than the 4x digital zoom of the standard 1x camera.